Burner



Jun? 1946- R. L. LONGINI BURNER Filed April 1'7, 1940 I INVENTQRZ F/c/mrd LLOhg/Il/ 24 M A TTORNEYS.

Putented June 25, 1946 BURNER Richard L. Longlni, Chicago, 111., assignor, by mesne assignments, to Whcclco Instruments Company, Chicago, 111., a corporation of Illinois Application April 17, 1940, Serial No. 330,157

3 Claims. 1

This invention relates to burners generally and more particularly to the type of burners which are provided with spark ignition means and in addition a flame path supervisory means wherein. some control effect is desired in accordance with the presence or absence of a flame path.

In the use of burners of the above character, difllculty has been experienced in the past where spark ignition means are used, in that ions produced in the spark gap, ii uncontrolled, may infringe upon the flame path supervising electrode, even when no flame is present, thus completing the flame circuit to said electrode and causing the control circuit, which includes the electrode, to function as if a flame were present. Obviously, when such a situation occurs, the safety function of the control circuit is impaired. For example, in such an event the control circuit which is supposed to shut oil the fuel supply when the flame is absent would permit the fuel to flow, since the ions generated in the spark gap by the ignition means force a conducting path between the control electrode and ground. This completes the control circuit as though such circuit were completed through the flame path.

The primary object of this invention is accordingly to provide a burner and spark ignition means therefor wherein ions generated in the spark gap by the ignition means are prevented from reaching the control electrode and thus Linpairing safety control functions. Other and further objects of this invention will become more apparent hereinafter as the same becomes better understood from an examination of the speciflcation and claims in conjunction with the accompanying drawing wherein:

Fig. l is a longitudinal cross sectional view of a pilot burner embodying this invention; and

Fig. 1a is an enlarged section taken. at the line la-la of Fig. 1.

Fig. 2 is an end view of the same with parts omitted.

Fig. 3 is a similar view of a modified form or F18. 4 is a fragmentary section taken at the line 4-4 of Fig. 8.

Referring to the drawing more particularly. reference character I designates ametallic burner tube formed open at one end and at its other end threadedly attached to a cylindrical cast body la. The body la is provided, at the end opposite to tube I, with a pressure sealing bushing 2 and shoulder in. The body I a is also provided with a fuel input tube 3. The fuel used in the burner illustrated is gas, but it will be apparent that.

2 with slight modifications, other suitable fuel might be used. The tube I is provided with threads 4 at one end for receiving a high temper ature resistant alloy cap 5. The cap 5 is provided on its outer end with a pair of right angle or crossed slots providing an orifice I8 and four supplementary right angular edges I! of the cap adjacent to said orifice. The cap 5 is also provided with a constricted intermediate tapered portion II and a cylindrical extension Ila. These portions I I and i la are integrally joinedloy a web lib leaving supplemental air openings lie for supplying any additional combustionair that may be needed. I

A spark electrode support rod la is mounted within an insulator 9 and forms, through electrode I, a spark gap I0 with the constricted portion II of the cap 5.

The insulator body 9 is provided with a shoulgo der 9a held against the shoulder 2a by the bushattached to the other end of the electrode support rod la by threads I l. The insulator body 9 is provided with a high tension guard hood extension I3 extending over the terminal plug I2. The retainer member 8 also acts as a coupling for the electrode extension rod 1.

In operation, fuel enters the tube I through the input 3 and passes out through the orifice it where combustion takes place. The spark gap III which ignites the flame is formed between the end of the electrode 1 and the constricted portion II of the cap 5, the cap 5 being grounded through the burner body, the flame being suppressed due to insuflicient oxygen within extension Ila.

It will be apparent that any ions formed by the spark gap I0 will not be permitted to escape freely, as in the case of other ignition means for burners previously used to form a path to any control electrode 20 which may be used either in conjunction with the burner shown or a main burner (not shown). The portion of the cap 5 outwardly of the constricted portion. II thereof and particularly the corners ll of the cap adjacent to the orifice I6 will ground any ions that may be produced by the spark gap I0.

As shown in Fig. 3, the orifice I6 may take the form of a screen I8 or perforated plate. The cap I9 shown is similar to cap portion Ila with orifice edges I1 removed in the previous embodi ment.

limited to the details shown or described.

I claim:

1. The combination of a burner for use in connection with a flame electrode situated in the vicinity of the flame path of the burner and which 1 electrode forms part of a control apparatus operable in accordance with presence or absence of burner flame, spark ignition means for said burner and means situated outwardly of said ignition means and extending substantially entirely across the burner between the same and the flame electrode and thereby substantially screening the flame path extending across the flame for grounding ions generated by said ignition means to prevent their contacting said electrode.

2. The combination of a burner for use in connection with a flame electrode situated in the vicinity of the flame path oi. the burner and which electrode forms part of a control apparatus operable in accordance with presence or absence of burner flame, spark ignition means for said burner, said burner provided with an inner oriflce at the ignition means, an outer oriflce therebeyond and means situated at the outer orifice and extending substantially entirely across the burner between the same and the flame electrode and thereby substantially screening the flame path across the flame for grounding ions generated by said ignition means to prevent their contactme said electrode.

3. The combination of a burner for use in connection with a flame electrode situated in the vicinity of the flame path of the burner and which electrode forms part of a'control apparatus operable in accordance with presence or absence of burner flame, a spark gap means and discharge member at the end of the burner, the discharge member partially enclosing the gap and extending substantially entirely across the burner betweenthe same and the flame electrode and thereby acting to substantially screen. same and extending across the entire width of the flame path for grounding ions generated by said spark gap means to prevent said ions from contacting said electrode.

RICHARD L. LONGIN'L 

